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Ascomyceteorg 07-03 Ascomyceteorg Lachnea poiraultii (Pezizales), rediscovered after more than one hundred years Nicolas VAN VOOREN Summary: Recent collections of a cup-fungus identified as Lachnea poiraultii Boud. from the Iberian and Is- Uwe LINDEMANN trian (Croatia) peninsulas provided the opportunity to investigate its modern taxonomic position. An exa- Marcel VEGA mination of the type specimen of this taxon confirmed the determination of Croatian, Portuguese and Miguel Ángel RIBES Spanish collections. Based on the results of multi-gene phylogenetic analyses which placed L. poiraultii within the Pyronemataceae with no support of affiliation with another genus, and the study of microscopic features Tomás ILLESCAS in the living state, the new genus Paratricharina is proposed to accommodate L. poiraultii. The morphological Neven MATOČEC similarities and differences from the most closely related species are discussed. A full description and illus- Ivana KUŠAN trations of P. poiraultii are also provided. Keywords: Ascomycota, Pyronemataceae, Tricharina, Paratricharina, taxonomy, phylogeny. Ascomycete.org, 7 (3) : 105-116. Juin 2015 Résumé : de récentes récoltes d’un discomycète identifié comme Lachnea poiraultii Boud. en provenance Mise en ligne le 13/06/2015 des péninsules ibériques et istriennes (Croatie) ont fourni l’opportunité d’évaluer son placement taxinomique moderne. Un examen de spécimens type de ce taxon a confirmé la détermination des récoltes croates, por- tugaises et espagnoles. Sur la base des résultats d’une analyse phylogénétique multigènes qui ont placé L. poiraultii au sein des Pyronemataceae sans support d’un rattachement à un autre genre, et l’étude des ca- ractères microscopiques à l’état vivant, le nouveau genre Paratricharina est proposé pour accommoder L. poi- raultii. Les similitudes morphologiques et les différences avec les espèces les plus proches sont discutées. Une description complète et des illustrations de P. poiraultii sont également fournies. Mots-clés : Ascomycota, Pyronemataceae, Tricharina, Paratricharina, taxinomie, phylogénie. Introduction ween spore length and width, the value in italics represents the mean value of this ratio. The terminology and abbreviations of cytological elements (cell Lachnea poiraultii was published by BOUDIER (1901) to accommo- date an operculate discomycete with an orange hymenium, hairy inclusions and exudates) related to the living cells are used after outer surface and microscopic characters similar to those of the BARAL (1992). Spore shape is given after KUŠAN et al. (2014). genus Tricharina Eckblad. Boudier included it in the genus Lachnea Macrophotographs were made in situ using digital cameras, while in his own sense (BOUDIER, 1885, 1907), i.e. a group of species in the microphotographs have been taken using digital cameras mounted Pezizales with stiff brown hairs, longer at the margin, and having directly on microscopes. Line drawings were made freehand to smooth or more rarely verrucose ascospores containing guttules. scale. No other collection of this species has been reported since its first description, for more than one hundred years. In the revision of Bou- DNA extraction, amplification and sequencing dier’s Icones by KORF (1985), this taxon was considered as a putative Geopora Harkn. or Humaria Fuckel species. Total DNA was extracted from dry specimens blending a portion Recent collections made in Croatia, Portugal and Spain, the exa- of them with the aid of a micropestle in 600 μl CTAB buffer (CTAB mination of type specimens, and phylogenetic analyses of multiple 2%, NaCl 1.4 M, EDTA pH 8.0 20 mM, Tris-HCl pH 8.0 100 mM). The DNA loci facilitated a re-circumscription of this species and a pro- resulting mixture was incubated for 15 min at 65 ºC. A similar vo- posal for its taxonomic placement. lume of chloroform: isoamyl alcohol (24:1) was added and carefully mixed with the samples and emulsified. It was then centrifuged for Materials and Methods 10 min at 13,000 g, and the DNA in the supernatant was precipitated with a 1/1 volume of isopropanol. After a second centrifugation for Morphology, cytology and cytochemistry 15 min at the same speed, the pellet was washed in cold 70% etha- The observations were made on fresh and dried material using nol, centrifuged again for 2 min and dried. It was finally resuspended methods of “vital taxonomy” (BARAL, 1992) supplemented with cy- in 200 μl of ddH2O. PCR amplification was performed with the pri- tological and cytochemical tests using lethal media applied directly mers ITS1F and ITS4 (WHITE et al., 1990; GARDES & BRUNS, 1993) for ITS, to the living cells; some small pieces of dried specimens were rehy- LR0R and LR5 (VILGALYS & HESTER, 1990) were used to amplify the 28S drated during about twelve hours in water. The following mounts nLSU region, EF1-983F and EF1-1567R (REHNER & BUCKLEY, 2005) for were used to observe microscopic characters: water, 0.5 and 5% the translation elongation factor 1α tef1 gene, and reverse of bRPB2- KOH, iodine reagents (Lugol’s solution, Melzer’s reagent), Methyl 6R2 (MATHENY et al., 2007) and a modified version of fRPB2-7.1R (MA- (Cotton) Blue both in lactophenol and lactic acid, and 1% aqueous THENY, 2005), fRPB2-7.1R2 (5’ – CCCATNGCYTGYTTVCCCATDGC – 3’) solution of CRB (Cresyl Blue Brilliant), Congo Red (CR, after PFISTER et for the RNA polymerase II second largest subunit, rpb2. PCR reac- al., 2009). Measurements were made on ≥ 20 ascospores mounted tions were performed under a program consisting of a hot start at in water from each collection, except on Croatian material where 50 95 ºC for 5 min, followed by 35 cycles at 94 ºC, 54 ºC and 72 ºC (45, living ascospores mounted in tap water were measured and 50 dead ascospores mounted in Methyl blue in lactic acid (in two Croatian 30 and 45 s respectively) and a final 72 ºC step 10 min. PCR products collections, both from spore deposits) to test the shrinkage of dead were checked on 1% agarose gels (visualized with GelRed dye), and spores. Spores are measured under the 100× oil immersion lens of positive reactions were sequenced with one or both of the sequen- transmission light microscopes, excluding the ornamentation. X re- cing primers. Chromatograms were checked in MEGA 5.0 (TAMURA et presents the mean value of spore dimensions, and Q the ratio bet- al., 2011) for putative reading errors, and these were corrected. 105 Phylogenetic analyses (15.0) 15.8–17.5 (18.2) × (8.1) 8.8–9.4 (10.3) μm [X=16.6 × 9.2 μm, BLAST was used to select the most closely related sequences from Q=1.6–1.8–2.0] in dead state from Methyl Blue/lactic acid mount, the International Nucleotide Sequence Database Collaboration hyaline, equatorially uninucleate, appearing non-guttulate in dead (INSDC) public databases. The selected sequences came mainly state (lipid bodies masked due to increased refractivity of collapsed from HANSEN et al. (2005a), HANSEN & PFISTER (2006), PERRY et al. (2007), sporoplasm) but with minute bipolar dispersed lipid aggregations HANSEN et al. (2013), and STIELOW et al. (2013), including those of Gla- that rapidly coalesce to form biguttulate lipid pattern in living state, ziella aurantiaca (Berk. & M.A. Curtis) Sacc., chosen as outgroup. In- more or less thick-walled, smooth observed in water and Cotton trons were removed from tef1 and rpb2 data sets. Sequences were Blue, but with a rough to finely verrucose perispore when mounted first aligned in MEGA 5.0 (TAMURA et al., 2011) software with its Clustal in Lugol’s solution, entirely encapsulated by delicate but persistent W application and then corrected manually. The final alignment in- sticky sheath best visible in CR mount. cluded 331/848 (28S nLSU), 355/867 (tef1) and 311/597 (rpb2) va- riable sites. The concatenated alignment was loaded in PAUP* Studied collections: CROATIA. Brtonigla-Nova Vas (Istra County), 4.0b10 (SWOFFORD, 2001) and each locus was subjected to MrModel- N 45.372144°, E 13.632355°, 112 m asl, 30 March 2013, leg. M.J. Šimić, I. Kušan & N. Matočec, CNF-2/9332 and 27 February 2014, leg. M.J. test 2.3 (NYLANDER, 2004). The Model GTR+Γ+I was selected for all par- Šimić, CNF-2/9560, both collected on sandy moist soil densely beset titions, and implemented in MrBayes 3.1 (RONQUIST & HUELSENBECK, 2003), where a Bayesian analysis was performed (LSU-tef1-rpb2 data by mosses along small stream in degraded thermophilic deciduous partitioned, two simultaneous runs, six chains, with temperature set forest of Ulmus canescens, Prunus spinosa and Rubus sp. PORTUGAL. to 0.2, and sampling every 100th generation) until convergence pa- Serra de Montejunto, N 39.18061°, E -9.02545°, 188 m asl, 24 January rameters were met after about 260,000 generations at which point 2014, leg. M. Vega, on bare ground, on a narrow footpath; pers. herb. the standard deviation had fallen below 0.01. The initial 25% of sam- M.V. 20140124-04, U.L. 178-14. SPAIN. Jaén, Aldeaquemada, Río pled trees were discarded as burn-in. In addition to Bayesian analy- Guarrizas, N 38.40786°, E -3.383139°, 700 m asl, 16 March 2014, leg. sis, a full search for the best-scoring maximum likelihood tree was T. Illescas, M. Á. Ribes et al., on naked soil, with some little mosses, close to a river; pers. herb. N.V. 2014.03.24, U.L. 179-14. Málaga, Jar- performed in RAxML (STAMATAKIS, 2006) using the standard search al- dín Botánico-Histórico La Concepción, N 36.76587°, E -4.42523°, gorithm (LSU-tef1-rpb2 data partitioned), the same model of nu- 90 m asl, 24 January 2015, leg. and det. M. Vega, conf. U. Lindemann, cleotide substitution, and node support evaluated by 2,000 on bare ground below Olea sp. between mosses (Barbula sp., Dicra- bootstrap replications. Significance threshold was set at or above nella sp., Bryum sp., Tortula sp.); pers.
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